BP72V18-2US rack/tower external battery pack offers extended battery runtime when used in conjunction with expandable 72V Tripp Lite rackmount or tower UPS systems. Includes heavy gauge cabling with high current DC connector for safe, simple installation. Included daisychain connector enables the connection of additional compatible 72V external battery packs to the host UPS. Included mounting accessories support 2U rackmount installation in 4 post racks. Options for 2-point front-rail mounting, 2 post center-mounting, wallmount and upright tower installation available.